Fluid or grease? If fluid (as in axle lube) then you need a seal replacement. If it is just grease, it may be the inner clamp was installed wrong (as mine was when I picked it up from GL) and you just need to reseat the inner clamp. It took me three tries before I finally figured out (with help from this forum) that the inner clamp MUST be installed at the TOP of the axle housing. The illustration in the TM shows the inner clamp installed toward the FRONT of the axle housing. If you install it that way, the knuckle will hit the clamp on a hard turn and knock the entire clamp and inner boot out of it's groove, causing a grease leak.